:root {
  --bg-color: #f0f2f5;
  --text-color: #333;
  --digit-bg: #ffffff;
  --digit-shadow: rgba(0, 0, 0, 0.08);
  --separator-color: #999;
  --date-color: #555;
  --accent-color: #007aff;
  --settings-bg: rgba(255, 255, 255, 0.9);
  --switch-bg: #ccc;
  --switch-knob: #fff;
}

html.dark {
  --bg-color: #121212;
  --text-color: #e0e0e0;
  --digit-bg: #1e1e1e;
  --digit-shadow: rgba(0, 0, 0, 0.4);
  --separator-color: #666;
  --date-color: #aaa;
  --accent-color: #0af;
  --settings-bg: rgba(30, 30, 30, 0.9);
  --switch-bg: #444;
  --switch-knob: #222;
}

html {
  font-size: calc(14px + 0.5vmin);
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto,
    "Helvetica Neue", Arial, sans-serif;
  background-color: var(--bg-color);
  color: var(--text-color);
  transition: background-color 0.3s ease, color 0.3s ease;
  overflow: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

.app-container {
  display: grid;
  place-content: center;
  place-items: center;
  height: 100vh;
  text-align: center;
  gap: 1rem;
  padding: 0 1rem;
}

.clock-wrapper {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 100%;
  font-size: clamp(1px, 15vw, 180px);
}

.digit-group {
  display: contents;
}

.clock-elements {
  grid-column: 2;
  display: flex;
  align-items: center;
  justify-content: center;
}

.digit-container,
.ampm-container {
  background-color: var(--digit-bg);
  border-radius: 0.1em;
  box-shadow: 0 0.05em 0.2em var(--digit-shadow);
}

.digit-container {
  width: 0.7em;
  height: 1.1em;
  overflow: hidden;
  margin: 0 0.05em;
  font-weight: 500;
}

.digit-roller {
  transition: transform 0.8s cubic-bezier(0.65, 0, 0.35, 1);
}

.digit {
  width: 100%;
  height: 1.1em;
  display: flex;
  align-items: center;
  justify-content: center;
}

.separator {
  font-size: 0.8em;
  font-weight: 300;
  margin: 0 0.1em;
  color: var(--separator-color);
  animation: blink 2s infinite ease-in-out;
}

@keyframes blink {
  50% {
    opacity: 0.3;
  }
}

.ampm-container {
  font-size: 0.2em;
  font-weight: 600;
  padding: 0.5em 0.8em;
  margin-left: 0.2em;
  letter-spacing: 0.1em;
}

.date-display {
  font-size: clamp(0.8rem, 4vw, 1.75rem);
  color: var(--date-color);
  font-weight: 300;
  padding: 0 1rem;
}

/* Settings Panel */
.controls {
  position: fixed;
  bottom: 1.5rem;
  right: 1.5rem;
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  gap: 1rem;
}

.settings-btn,
.settings-panel {
  background: var(--settings-bg);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.2);
}

.settings-btn {
  border: none;
  border-radius: 50%;
  width: 3.25rem;
  height: 3.25rem;
  font-size: 1.5rem;
  cursor: pointer;
  display: flex;
  justify-content: center;
  align-items: center;
  transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}
.settings-btn:hover {
  transform: scale(1.1) rotate(30deg);
}

.settings-panel {
  border-radius: 12px;
  padding: 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 1rem;
  transform-origin: bottom right;
  transform: scale(0.95) translateY(10px);
  opacity: 0;
  visibility: hidden;
  transition: transform 0.2s ease, opacity 0.2s ease, visibility 0s 0.2s;
}

.settings-panel.active {
  transform: scale(1) translateY(0);
  opacity: 1;
  visibility: visible;
  transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1), opacity 0.3s ease,
    visibility 0s 0s;
}

.setting {
  display: flex;
  justify-content: space-between;
  align-items: center;
  width: 220px;
  font-size: 1rem;
}

/* Custom toggle switch */
.switch {
  position: relative;
  display: inline-block;
  width: 50px;
  height: 28px;
}
.switch input {
  opacity: 0;
  width: 0;
  height: 0;
}
.slider {
  position: absolute;
  cursor: pointer;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-color: var(--switch-bg);
  transition: 0.4s;
  border-radius: 28px;
}
.slider:before {
  position: absolute;
  content: "";
  height: 20px;
  width: 20px;
  left: 4px;
  bottom: 4px;
  background-color: var(--switch-knob);
  transition: 0.4s;
  border-radius: 50%;
}
input:checked + .slider {
  background-color: var(--accent-color);
}
input:checked + .slider:before {
  transform: translateX(22px);
}